Method and apparatus for applying tape



- April 21, 1931. c, OLSEN v 1,801,972

METHOD AND APPARATUS FOR APPLYING TAPE Filed March '7, 1930 4Sheets-Sheet l 1 6 I} I h l April 21, 1931. c. OLSEN METHOD ANDAPPARATUS FOR APPLYING TAPE Filed March 7, 1930 4 Sheets-Sheet 2 April21, 1931. c. OLSEN 1,801,972

METHOD AND APPARATUS FOR APPLYING TAPE Filed March 7. 1950 Q 4Sheets-Sheet a April 21, 1931. c. OLSEN METHOD AND APPARATUS FORAPPLYING TAPE Filed March 7, 1930 4 Sheets-Sheet 4 Patented Apr. 21,1931 "unites s'rairss PATENT oFFic- E CARL OLSEN, or LYNN,MAssAoHU'sn-r'rs, AssIsivoR TO EXCEL Terms MecHInn 00.,

or LYNN, "MASSACHUSETTS, A oonronnrroiv or MASSACHUSETTS METHOD AnnAPARATUS non APPLYING TAPE Application filed March 7,

This invention relates to the application of pressure to, andmanipulation of, moving sheet or strip material, and more particularlyto a method .and apparatus for applying tape in adhesive engagement witha sheet article or the like, such for example as reinforcing tape whichis applied to edge and/orseam portions of shoe uppers or the like.

Infone aspect this invention is directed to the type of machine and wayof. applying tape which is disclosed in the copending ap niplication ofJerome P. Byron, Serial No.

216502, filed August 31,;1927, and the copending application of LelandK.Butler, Serial No. 331,550, filed January 10, 1929. These cop-endingapplications in general show :a machine having juxtaposed rolls and tapesupplying instrumentalities arranged whereby adhesively coated-tape isengaged by a peripheral portion of one of the rolls and supplied to atape guide adjoining the bit of the rolls. Sheet material is fed betweenthe rolls and pressed. thereby into firm adhesive engagement with thetape. The copending application of Leland K. Butler discloses a machineof this same general type in which selectively actuable mechanism isprovided for severing the adhesive tape to :permitthe rapid applicationof strips of the tape to successive separate sheetartic'les such asparts of shoe uppers. q My invention aims to-facilitate the propermovement of the tape into engagement with the sheet articles under alloperating conditions. Thus one object of the present invention ist-oprovide for preventing the undesirable sticking of the uncioated surfaceof the tape to the peripheral portion of the juxtaposed roll, which isnormally effective in feeding it to the bite of the rolls. A machine ofthis character may ordinarily be employed for applying tape having apermanently tacky, tenaciou'sly adhesive agglutinant to a sheet article.The tape is ordinarily supplied in rolls having convolutions in adhesiveengagement with each other and as successive convolutions of the tapeare removed from the roll there is actendency for a portionof theadhesive to cling to the uncoated 1930. Serial No. 434,144.

surface of the tape, and hence for the tape undesirably to adhere to theperipheral "portion of the roll. lVetting of the uncoated surface of thetape effectively prevents such a phenomenon and permits the properfrictional engagement of the tape with the-pe ripheral portion of theroll without undesirable sticking thereof.

The present invention provides for rapidly varying the amountof pressureapplied to the sheet materialfbeino' taped or otherwise operated uoon.Preferabl a vibratory movement is im arted to one of the rolls, vhichmovement may desirably have an amplitude of an order less than that ofthe thickness of the sheet material fed between the rolls, so that thegripping effect of the rolls is rapidly varied, although under normaloperating conditions a substantially continuous frictional engagementofgreater or.

less intensity is maintained between the rolls and the interposed sheetarticle and tape. This is particularly advantageous in per mitting theturning of the sheetarticle in relation to the tape, thus for examplepermitting the application of the reinforcing tapeto upon materialofdirl' rent thicknesses andi i; I

different classes of work. These desirab 6 results are preferablyobtained providl a cam having a pluralityof throws of mm height forcausing rapid and slight vibratory movement of one of the rolls, and acooperate mg follower assembly which is adplstable to permit variationof even this small am} tude of movement. v p

A further feature of the present invention is an. arrangement of theoperating instrupuchering Fig. 1;

1g. 3 18 a section on the line 3-3 of Fig. 2, lllustratlve of part ofthe meclnunszn e ployed in ainzomatically and periodici hevnw then'essure of the o J ios d rolls of the device;

Fig. 4-. is a rear end elevation of the dewic with the operating pulleyand hand wheel partly broken away, and showing the arrangement ofdriving gears norn any concealed by this ulley and hand wheel;

Fig. 5 is a ragmentary side elevation of the side of the device fromopposite to that shown in Fig. 2, and with the pulley ant hand wheelremoved;

Figs. 6 and 6 are sections on. the line 6-6 of Fig. 2, Fig. 6 showingthe tape nding and presenting mechanism of the device in position forthe cooperating pressure rolls to advance the tape and apply it to sheetmaterial interposed between the rolls, and lL ig.

6 showing the pivoted gnide-actuatin arm of the device and the retainedtape guide swung to a position wherein the tape may be cut, and showingthe tape cutting instrumentality projected for severing the tape;

Fig. 7 is a fragmentary plan view showing parts of the pivotallyn'iounted guide re ,ainmg arm, one member of its associated tape guide,and the pressure roll adjacent which the tape guide moves;

Fig. 8 is a top plan view of a and interchangeable part of the tape g1;

Fig. 9 is a bottom plan view of the part (2.1. the tape guide shown inFig. 8;

Fig. 10 is a section on the line illid of Fig. 8; and

Fig. 11 1s a fragmentai section on the line i1-11 of Fig. 2.

In the illustrated embodiment of my invention, referring to Fig. l,adhesive tape indicated by the reference character 11 may be appliedfrom a closely wound roll 12 supported by any suitable bracket Thepressure applying device, which includes the two opposed pressure rolls1% and l5. preferabl driven at approximately the same peripheral speed,serves to withdraw the t2 from the roll of tape in the manner dis .osedin the eopending applications referred to above, the

tape passing over a pulley 16, thence partially around the periphery ofthe lower pressure roll 15 over a tape tensioning or take-up roll 17retained on a pivotally mounted and outwardly spring-pressed arm 18,thence farther around the periphery of the lower pressure roll 15 andthrough suitable tape guiding instrumentalities which in the normaltaping operation, indicated in Figs. 1 and 6, present the tape to thebite of the juxtaposed pressure rolls. Sheet material indicatedgenerally by the letter S may be fed between the pressure rolls, and thetape 11 thus progressively applied to its under side. Ac ordingly theadhesive tape is fed to the device so that its adhesively coated side isoutward as its passes around the periphery of the lower pressure roller15 toward the bite of tlie rolls.

he frictional engagement of the tape with the periphery of the rollbefore passing to the guiding means is chiefly effective in drawing thetape run from the roll 12 so that the tape as supplied to the bite ofthe rolls is substantially free of tension. Adhesively coated tapewithdrawn from a tightly wound roll is somewhat adhesive on its uncoatedface and normally would exhibit a tendency to adhere to and be advancedby the pressure roll 15 after having been severed, at which time it isdesirable that feeding of the tape be suspended. To avoid suchdifliculty of overfeeding of the tape after severance, I prefer toreduce somewhat the adhesiveness of the uncoated face of the tape priorto its contacting with the pressure roll 15 by interposing a moisteningdevice, such as indicated in Fig. l by the reference numeral 20, betweenthe supply of adhesive tape and this pressure roll. In the illustratedembodiment of my invention this moistening device 20 comprises aninverted channel element with a top and depending side guiding themoving tape and pivoted at 21. to a suitable projection 22 extendingfrom a fixed part of the end of the machine. Some liquid retainingelement, such for example as felt 23, is retained within the shoe 20between the tape and the upper side of the shoe, and liquid, such aswater, may be supplied at intervals to this felt through an opening 24in the top of the inoistening device. The moi toning device accordinglyrides upon the top of the run of tape and applies moisture to the backface of the tape and thus materially reduces the tackiness or tendencyof this back face of the tape to cling of its own accord to the lowerpressure roll 15. An extension 22a of member 22 forms a scraper for roll15.

Referring to Figs. 2 and 5, the casing of the pressure applying device,which serves to retain the pressure applying rolls and to enclose mostof the controlling and actuating elements of the pressure-applyingmechanism comprises generally two parts, a lower hollow base part 30 andan upper movable head or frame 31, provided with a depending roan wardlyextending 51-11132 (Fig.5) pivoted at 33 to the base 30. shown in, Fig.11, a tongue 150 projects from the lower or base part '30 of the casingand is engaged=byopposite sides 151 of a slot in the movable frame orhead, thus 'toretain 'themovable frame in alignment with the base, whileallowing'vertical movement of the movable frame'about the pivot 33.

The lower pressure roll is mounted, as shownin Fig.2, upon an upwardlyextendin part 35: of a hollow extension 35*of thebase,,:

while upper pressure roll '14 is similarly mounted upon a downwardlyextending part 36 of ahollow'extension '36 of the movable frame 31. Inthis way a relatively large open space indicated in Fig. 2 by thereference character A is provided for'the passage or.

manipulation of sheet material when-desired.

To augment'theeifect of gravity in forcing the, upper roller 14towardthelowe'r roller 15, I have provided a coilsprin'g 'l20forreacting upon the movable frame '31 to force it, to-' get-her with its"roller 14, toward thebaseand roller 15. Referring to Fig. 2,1'the upperend of spring '120'en'gages apart 12'1ofthe base and its lower endengages'anut 122 threaded .on a rod, 123 which e'xtends'thr'oughthem'ovable frame'31. Rod 123 'isrotatably m'ounted in a bearing 124inthe movable framea'nd a hand wheel 125 anda "collar 126 on the rodprevents vertical movementof the rod .relative to ,the head. Thepressure thus applied by the spring 120 to theopposed rollers may bevaried 'by rotating the hand wheel 125,

thus turning the rod 123 relative to the nut.

122 and causing the nut, which is restrained against rotation by thesliding engagement of a forked extension 1'27withafixed rod 128,.

to travel up or down and "ithe-r t'compress or relieve the spring.

, To permit the upper movable frame 31to be selectively raised fortheeasy insertion of sheet material "between the rolls "or for any.

other purpose, I have provided a lever 130 pivoted at 131 to the base,andad'apt'ed to bear upwardly at one end against a collar 132 fixed onthe rod 123 and to raise the rod 123, the movable frame and theup'perpressure roller. The opposite-end ofthe lever 130 is connected toanoperating rod 134 which may be 'connected to any suitable treadle, notshown, 'to

' permit the operator of "the device to raise the movable frame by footactuation. V

A main shaft 3,7 retainedjin suitable bearings in the basef30 is keyedto'a combined hand wheel and pulley 3'8 which 'serves to re- .ceive power.from any suitable source. Re-

ferringto Fig. 4, wherein this hand. wheel and-pulley 38 is not shown,the reference symbol 88* indicates an axially dis posed pinion tormingpart of the "hand wheel pulley andrwihich serves to transmittherotarymovement ofthe hand wheel pulley to the various automatically actuated,parts of "the 'c levice. Pinion 88 meshes with a gear wheel 39 whichcarriesa pinion-dmeshing 1n turn with a gearfwheell 41 keyed toa'horizontal shaft 42 :(see also Fig. '2) which extends lengthwise of thedevice th'rouglrthe hollow base and drives the *loWer pres'sur'eroll 15through in termeshing gears 43 and 44 "(Fig 1'). Referring again to Fig.4, gear wheel 41 acting through, gear. wheels47, 48 and 1 49 also drivesahorizontal shaft '50 (see also Fig. 2) whichextends forwardlythroughfthe hollow upper header frame of the device, and,as shown in"Fig. 1, drives it'he upper pressure roller through intermesh-ing *gearwheels 52 and 53.

Preferablyfthe 'numberand sizes of the driving gear wheels employed is:such that the opposed rollers 14 and '15 will rotate at, or

approximately at,"the same 'peri'pher al speed.

Referring to Fig. 4 it will be noted that the uppermost gear wheels 48and49 at the rear "end of'the device are retained by the movable frame31, with the other gear wheels below "thesetwo'are axially'fixed withrespect to the base 300i the device; however, the pivot 33issubstantially in the planes of these gears so that the slight swingingmovement of l1ead31'does not'appr'eciably afiect their interme's'hedengagement; 1

Tl'ie inner end ofmain shaft 37 carries cam 60 "(Figs 2and3) whichserves automatically to relieve (preferably only partially) the pressureapplied by the opposed rollers tothe sheet material operated on, thus topermit the sheet material to be turned whilebetween the rolls. This cam60 has a contour preferably approximating that of a cylinder disposedaxially of the shaft but having 2 around its periphery slightly"flattened 'porsurface of the cam follower 62, whereby rotary movementof the cam 60 is adapted to cause vertical oscillation of the movableframe 31 and rapidly and periodically to relieve the pressure exerted bythe upper pressure roller 14 upon the sheet material passing between thetwo pressure rollers. By utilizing a cam having relative small throwsand capable of causing rapid oscillation of themovable frame 31 .th'efeeding of mat rial between the pressure-rollers is notrendered-discontinuous but "the pressure may merely be *rapidlyrelivedsufiiiently to perl mit turning of sheet material interposed between therolls. Preferably and as will be apparent from an inspection of thevarious gears shown in Figs. 4 and 1, the driving gears connecting thecam 60 with the pressure rolls comprise reduction gearing, the cam 60rotating much faster than the pressure rolls. I prefer that the numberof throws per revolution of the cam, the gear ratio of the gearsconnecting the cam and the pressure rolls, and the diameters of thepressure rolls be proportioned to provide an oscillation of the upperroll for each very small linear distance of advance of the sheetmaterial. For example in the illustrated embodiment, the upper rolloscillates once during each a proximately one-seventh inch of advancethe sheet material. Thus in o crating on a sheet of material of someslig 1t compressibility, such for example as a sheet of leather, thedistance of advance of the sheet material during a given cycle of in- Icrease and reduction of pressure by the rolls may be, and preferably is,less than the len h of sheet material contacted thereby at t ie time ofapplication of maximum pressure. Accordingly a close approach towarduniformity of compression of all parts of the strip thus acted on isobtained. With this advantageof approach to uniformity of compression,the capability of ready turning of the sheet material relative to therolls is also attained.

An accurate adjustment of the amount of oscillation of the movable head31., and hence the extent to which pressure of the rolls is periodicallyand almost instannncously relieved, may be obtained by means of theadjusting screw 68. Since the upper pressure roll 14 normally bears upon the sheet material disposed between the rollers, obviously the extentto which pressure is relieved. may be adjusted by turning the screw 68to permit the abutment member (36 to rise slightly from the positionshown in Fig. 3 thereby ordinarily utilizing only a portion of thethrows of the cam 60 for displacing the movable frame to relieve thepressure. Continued movement of the adjusting screw (38 sufiicient toprevent the transmission of force from the eccentric follower to theupper uiovable frame 31 allows the upper prei-tsure roller to bear withconstant pressure upon the sheet material interposed. between therollers. This adjustment of the device may be preferable when the sheetmaterial being fed between the rolls need not be turned. as for examplewhen the tape is to be fed to a straight edge or seam of the sheetarticle.

The feeding and cutting mechanism associated with the lower roll 15, andwhich is of the general type described and claimed in the copendingapplication of Leland K. Butler referred to above, comprises in additionto the idler roll 16 and tension roll 17, a pivotally mounted arm 70movable about the axis of pressure roller 15 and carrying at one endtape guiding parts, and at its opposite end a spring-retained dog foroperating the cutting instrumentality. 7

Referring to Figs. 6, 6, and 7 to 10, this pivotally mounted arm 7 Ocarries at one extremity a lower tape guide 71 having a slot 72 (Fig.7), adjacent its free end and pivotally mounted upon a pin 73 retainedby the swinging arm 7 O. A suitable coil spring 74 bearing upon theextremity of the pivoted arm 70, passing around the pin 73 and connectedto the tape guide 71, serves to urge the tape guide toward the peripheryof the adjacent roller 15. An upper tape guide 77, shown separately inFigs. 8 to inclusive, comprises a metallic strip having one end turnedback on itself, as shown at 78, with opposite edge portions 7 9 of thisturned-over part bent down to engage the side surface of the pressureroll 15, (see Fig. 0), and having a slot 80 in its turned-over part,adjacent its end. As shown in Fig. 0, the tape guide 77 is retained uponthe lower tape guide 71 by means of pins 85 attached to the latter andextending up through holes 85 in the former, and by a threaded stub bolt87 carried by the lower tape guide extending through a slot 88 in thetape guide 77 and carrying a detachable nut 89 which serves securely toclamp the two tape guides together while permitting detachment of theforward tape guide at will. lllith this construction, the slotted tapeguide 77 may easily be removed and another similar tape guide besubstituted having, for example, a tape-feeding slot 80 of differentwidth.

A tape catch 90 which prevents backward motion of the tape duringswinging of the tape guides, is also pivotally mounted upon the pin 73,bears at its serrated free end 91 upon the tape passing around theperiphery of the lower roller 15, and is yieldably pressed thereagainstby a part of the spring member 74, as shown in Fig. 7.

The opposite end of the pivoted arm 70 carries a dog 92 pivoted theretoat 100, and normally retained by a spring 93 against the stop pin 94. Afixed bracket 95 disposed between the pivotally mounted arm 70 and theroller carries a detachably mounted knife casing 96 containing aslidable knife carrier 97 normally retracted by a spring 103, and havingaknife 99 at its outer end adjacent the path end of the knife carrier 97is provided with a striker element 101 which may conveniently comprisethe head of a screw held in adjusted relation to the carrier by a nut102. Striker 101 is so positioned end of the dog 92 that it is engagedthereby when the dog moves upwardly in response to a swinging movementof the pivoted arm in the direction of the arrow in Fi 6, and is movedby the dog to cause the knife carrier of the moving tape. The rear inrelation to the upper It 97 to project the knife 99 into the path of thetape, as indicated in Fig. 6 Referring to Fig. 6 whichshows the pivotedarm 70 near the end of its swinging movement,.it will be noted thatfurther swinging movement of the arm in the direction of the arrow willserve to disengage the dog 92 from the striker 1 01 and permit the knife99 to be retracted from its cutting position by the spring 103. l

Referringto Fig. 6, it will be seen that during the application of tapeby the device, the tape guide 77 positions the tape closely adjacent tothe point of application of pressure by the opposed rollers-14 and 15,thetape guide 72 retains the tape above and out of contact with theserrated edge of'the knife 99, while the tape catch 90 bears upon thetape being fed to the two tape guides. In swinging the pivoted arm 7 0to'cause the dog 92 I to actuate the'cutting knife 99, the two tapeguides and the tape catch are simultaneously,

and in advance of severance of the tape by the knife, swung partiallyaround the periphentirely out of the path of the knife. During thisbackward movement of the tape guides, the tape catch 90 dragsupon thetape and prevents itfrom being drawn back by the tape guides. In thetape cutting positionof Fig.

6., the two tape guides engage the tape below the knife so that afterseverance of the tape and return of the tape guides to the tape applyingposition of Fig. 6 the free end of the tape Will bepresentedby the tapeguide 7.7 to a position between the pressure rolls-for further feedingof tape.- It may be observed essarily sever the tape by chopping action4 alone, but is aided in cutting the tape by the forward pull of thetape with. respect to the knife, by the cooperating pressure rollers 14and 15. I

" H For. the purpose of actuating the pivoted arm 7 0 tocause thesecooperating movements of the tape guide and cutting knife, I provide animproved operating mechanism which may. be mainly contained within thehollow base 30 of the device and hence doesnot obstruct thefreedom ofmovement of material or. interfere with the operator ofthe device.Referring toFig. 6, a sector gear 105 intermeshes with correspondinggear teeth 106 on the pivoted arm 70. The shaft 107 (see also Fig. 2).mounted in suitable bearings in the base of the device extendsrearwardly through the base, is adapted to oscillate this.

sector gear 105 to swing the pivot arm 70.

A lever arm 108 rigidly affixed to shaft 107 M is connected toa suitablevertical operating means therefor to cause the rolls to havesubstantially the-same'peripheral speed, means yieldab'ly urging therolls toward each other,

vibratory means for'varying the exact juxtaposition of the rolls, and aguide for directing a strip between the rolls, whereby a sheet articlefed into contact with the stripbetween the rolls may be readily turned.

2. Apparatus of the class described comprisinga pair of juxtaposedrolls, means for feeding tape between the rolls, a swinging framesupporting one of the rolls and its drive shaft, a springv connected tothe swingingframe yieldably urging the rolls, toward I each other, and acam and follower to cooperate with the spring to cause a vibratorymovementof the frame and the roll supported thereby. i y

3. Apparatus for the classdescribed comprising juxtaposed rolls forprogressively applying'pressure t0 sheet-material fedtherebetween, andmeans for relievingthe pressure thus exerted a plurality of timesduring-each revolution of one of the rolls.

therebetween, means for automatically and periodically movlng one of therolls away from the other roll during rotation thereof,

thereby to relieve the pressure on the sheet material at frequentintervals and facilitate turning of the sheet material with respect tosaid'rolls. p

5. Apparatus of the class described comprising opposed rolls arrangedprogressively to apply pressure'to sheet material fed therebetween,means for feeding'tape between the rollersin position to be, pressed bythe rolls intoadhesive engagement with the sheet material, and means formoving one of the rolls away from the other roll a plurality of timesduring each revolution of one of the rolls.

6. Apparatus of the class described comprising a base, a movable head, apressure roll mounted on said base, a shaft for driving said roll,second pressure roll retained by said movable head in juxtaposition tosaid first named pressure roll, a shaft in said movable head for drivingsaidsecond roll, spring means for forcing said movable head toward saidbase thereby to cause said rolls to exert pressure upon sheet; materialinterposed between said rolls, cammeans' for automatically and"periodically forcing said movable head away fromsaid base thereby torelieve the pressure exerted-by the rolls, and drive gearing'interconnectingsaid two shafts and said cam'means. y

7; Apparatus of the class described comprising a base, a movable head, apressure roll retained by said base, a second pressure roll retained bysaid movable head in opposition to said first-named pressure roll,spring means for forcing said movable head toward said base thereby tocause said rolls to exert pressure upon sheet material interposedbetween said rolls, a cam revolvably mounted on said base, a followermounted to contact with said cam, means carried by the movable head forcontacting with said follower to cause the follower periodically toforce the movable head away from the base thereby to relieve thepressure of the rolls upon the interposed material, and drive gearinginterconnecting said two pressure rolls and said cam.

8. Apparatus of the class described comprising 1uxtaposed pressurerolls, means for forcing said rolls together to apply rolling pressureto sheet material interposed therobetween, cam means for automaticallymoving one of said rolls away from the other roll during rotationthereof to relieve pressure on the interposed sheet material, andadjustable means for determining the amount of movement thus effected.

ing to the periphery of one of said rolls and between the rolls, cuttingmeans movable into the path of the tape for severing the tape, a'

pivoted arm and a tape guide carried thereby normally between saidcutting means and tlr point of opposition of said rolls and movable byswinging of said arm to the opposite side of said cutting means, sectorgear teeth associated with said pivoted arm adjacent its pivot point; asector gear meshing with said teeth, an oscillating shaft extendinglaterally through the frame for actuating said sector gear.

11. Apparatus of the class described comprising juxtaposed pressurerolls, means for guiding adhesive tape through a path generallyconforming to the periphery of one of the rolls to present the tape tothe compressive action of the rolls, thereby to affix the ta e to sheetmaterial interposed between the rolls, and means for moistenin the tapeprior to its contacting with the I'Oil around which it travels, therebyto prevent sticking of adhesive coating upon the tape to the said roll.

12. In a machine of the type having a pair of juxtaposedpressure-applying rolls which are normally yieldably urged toward eachother, driving mechanism to effect the rotation of the rolls atsubstantially the same peripheral speeds, a support for one of the rollsrelatively movable in relation to the other roll, a fixed frame for theother roll, driving mechanism for the rolls, and a shaft mounted uponthe frame and having a portion in eccentric relation to its aXis ofrotation, means associated with said portion and with the movablesupport to vary the relative position of the support and correspondingroll with respect to the frame and the roll supported thereby, whereby arelative vibratory effect is in'iparted to the rolls as they rotate atsubstantially the same peripheral speech 13. A machine of the classdescribed comprising a lower frame portion, an upper frame portionhaving a limited swinging movement in relation to the lower frameportion, a roll carried by each of said frame portions, drivingmechanism for said rolls arranged to effect their movement atsubstantially the same peripheral speeds, a shaft hav ing a portion ineccentric relation to its axis and motion-transmitting means disposed between the eccentric portion of said she t and the swinging frame memberwhereby vibratory movement may be imparted to the frame member and thecorresponding roll when the driving mechanism is operated.

14. Method of pressing sheets in adhesive engagement with each other,which comprises, continuously moving the sheets between pressureapplying elements and continuously moving the portions of the elementswhich contact the sheet in the direction of sheet movement while rapidlyvibrating the elements in relation to each other thereby causing rapidfluctuation of the imposed pres sure.

15. Method of pressing sheets in adhesive engagement with each other,which comprises coi'itinuously moving the sheets between pressureapplyii'ig elements and continuously moving the portions of the elementswhich contact the sheet in the direction of sheet movement while rapidlyvibrating the ole n'ients in relation to each otherand so controllingthe amplitude of vibration that pressure of varying amount iscontinuously being applied to the sheets.

16 Method of pressing sheets in adhesive engagement with each other,which comprises continuously in oving the sheets between pressureapplying elements and continuously moving the portions of the elementswhich contact the sheet in the direction of sheet movement while rapidlyvibrating the elements in relation to each other and so controlling thefrequency of vibration in relation to the rate of sheet movement and theyieldability thereof under the maximum imposed pre sure that onecomplete Vib'ation occurs during a time of the order of that requiredfor the movement of a given point on a moving sheet through the area ofcontact as determined by maximum compression.

17. Apparatus of the class described comprising a base, a movable head,a pressure roll mounted on said base, a shaft for driving said roll, asecond pressure roll retained by said movable head in juxtaposition tosaid firstnamed pressure roll, a shaft in said movable head for drivingsaid second roll, spring means for forcing said movable head toward saidbase thereby to cause said rolls to exert pressure upon sheet materialinterposed between said rolls, drive means for rotating said rolls atsubstantially the same peripheral speed, a rotatable cam, meansassociated With the drive means and the'cam for rotating the latter atspeed substantially higher than that ofthe rolls, andfollower meansassociated with the cam and head causing the latter and the rollsupported thereby rapidly to be vibrated in relation to the base and theroll carried thereby.

18. Apparatus of the class described comprisin a base, a movable head, apressure roll mounted on said base, a shaft for driving said roll, asecond pressure roll retained by said movable head in juxtaposition tosaid first-named pressure roll, a shaft in said movable head for drivingsaid second roll, a spring means for forcing said movable head towardsaid base thereby to cause said rolls to exert pressure uponsheetmaterial interposed between said rolls, drive means for rotating saidrolls at substantially the same peripheral speed, a rotatable cam, meansassociated with the drive means and the cam for rotating the latter atspeed substantially higher than that of the rolls, a swinging membercarried upon said base and having a roller engaging the cam, and anabutment member mounted upon the head to engage the swinging memher,said abutment member being adjustably' mounted to vary the vibratorymovement imparted to'the head by the cam.

Signed by me at Lynn, Mass, this first day of March, 1930.

V CARL OLSEN.

